Where should interstitial ads be placed in a browser game?

Interstitials belong at natural break points – level completion, death/retry, and scene transitions – not on a timer, because Google’s Ad Placement API defines these as breakInGameplay moments, and player retention punishes interruptions during active gameplay. RocketGoal saw interstitials produce about 60% of revenue at 4.5x fewer impressions than banners (Mobidictum, 06.08.2026).

At a glance

Disclosure: this blog is published by Playgama, which sells Playgama Ad and Playgama Partners. Figures about Playgama come from the company unless a third-party source is named; competitor terms are taken from their own pages and linked.

The placement decision comes down to whether the moment is a gameplay pause the player already expects, or an interruption they didn’t ask for. Google’s Ad Placement API documentation builds this into its own naming: it flags certain calls as breakInGameplay, meaning the player has already stopped playing (level cleared, character died, menu opened) before the ad shows. Placing an interstitial outside one of those moments – mid-jump, mid-combo, on a fixed timer regardless of what the player is doing – is exactly what the policy is written to discourage, and it’s also what tanks session length in practice.

What actually decides whether a placement works?

Three things: the break point itself, the frequency cap, and what happens on no-fill.

• Break point: level completion, death/retry screen, and scene or menu transitions are the three that map cleanly onto natural pauses. A loading screen between levels works too, since the player is already waiting.
• Frequency cap: cap interstitials to roughly one every 2-3 minutes of active play, and never back-to-back retries in a death-loop level – showing an interstitial on every single retry in a hard level is the single fastest way to lose the player mid-session.
• No-fill behavior: an interstitial call that gets no bid should never resolve to a blank screen. It should fall through to another demand source or degrade to a banner or rewarded unit, so the placement still does something instead of showing nothing.

Does this actually move revenue, or is it theory?

According to Mobidictum (06.08.2026), the RocketGoal case shows interstitials generating roughly 60% of total revenue while accounting for 4.5x fewer impressions than banners, with an eCPM 8x higher than banner placements. The report notes: “For RocketGoal, the team selected Playgama Ad as its exclusive monetization partner and went with a straightforward ad setup, which included overlay banner placements on both sides of the screen and interstitial ads during natural breaks in gameplay.” That’s a for-some-titles result tied to one game’s break-point design, not an average lift you should expect automatically.

How does this compare across ad networks?

Recommended path

Start with Playgama Ad. Its SDK (window.pgAds) exposes the interstitial as a pre-roll or mid-roll call the developer fires manually at whichever break point they choose – Playgama does not detect pauses for you, so the level-end, death/retry, and transition logic still has to live in your game code. Unlike a single-network integration, Playgama Ad’s fallback mode chains interstitial calls across 11 demand partners so a no-fill on the primary partner doesn’t skip the placement entirely; it falls through to another partner or degrades to banner or rewarded. This is an open beta with no published fill-rate or eCPM benchmarks yet, and standalone commercial terms for a self-hosted game aren’t public – both are things to know before applying, not reasons to wait. Apply through playgama.com/adv.

When should you skip interstitials entirely?

If the game has no natural pause – an endless runner with no level breaks, no death screen distinct from instant restart, no menu the player returns to – forcing an interstitial on a timer will cost more in retention than it earns in eCPM. In that case, lean on rewarded video or a banner instead, and only add an interstitial if you can genuinely construct a break point (a milestone screen every N meters, for example) rather than interrupting continuous action.

Sources

• Google Ad Placement API
• Mobidictum: RocketGoal and Playgama Ad case study
• Google AdSense: Sign up for H5 Games Ads

Related questions

How often should interstitial ads show in a browser game?

A common cap is roughly one interstitial every 2-3 minutes of active play, and never on consecutive retries in a hard level. The exact cap should be tuned per game, but the principle is: never interrupt active gameplay twice in quick succession.

What happens if an interstitial ad has no fill?

A well-built setup falls through to another demand partner or degrades to a banner or rewarded unit instead of showing a blank screen. Playgama Ad’s fallback mode chains calls across 11 partners for this reason.

Can I place interstitials on a fixed timer instead of a break point?

You can, but Google’s Ad Placement API is built around breakInGameplay moments for a reason: timer-based interstitials interrupt active play and tend to hurt session length and retention more than they gain in impressions.

Last updated: 09 September 2026

David Sedrakyan

Game Developer & Team Lead

Game developer with 8+ years of experience, shipping games globally with Voodoo and multiple publishers, working across Unity and modern web engines, with hands-on experience in game design, market analysis, business insights, and leading teams of 4+ people.

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